کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8492831 | 1552435 | 2011 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of grass silage harvesting time and level of concentrate supplementation on nutrient digestibility and dairy goat performance
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کلمات کلیدی
digestible organic matter in dry matterDMIPBVaNDFomNDFFFAECMAATD-value - ارزش DFree fatty acids - اسیدهای چرب آِزادenergy corrected milk - انرژی تصحیح شیرMetabolizable energy - انرژی متابولیزه شدهDairy goats - بز بزprotein balance in the rumen - تعادل پروتئین در شکمبهConcentrate - تمرکزMilk production - تولید شیرNEL - درbody mass index - شاخص توده بدنBMI - شاخص توده بدنیneutral detergent fiber - فیبر مواد شوینده خنثیdry matter - ماده خشکFeed intake - مصرف غذاdry matter intake - مصرف ماده خشکNitrogen - نیتروژنbody weight - وزن بدنcrude protein - پروتئین خام
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Effects of grass silage harvesting time and level of concentrate supplementation on nutrient digestibility and dairy goat performance Effects of grass silage harvesting time and level of concentrate supplementation on nutrient digestibility and dairy goat performance](/preview/png/8492831.png)
چکیده انگلیسی
The effect of harvesting time (HT) of timothy-dominated grass silage and level of concentrate on the chemical composition of silage, and on feed intake and milk production by Norwegian dairy goats, were evaluated. The silages were prepared from the primary growth at three stages of maturity: very early (HT 1), early (HT 2) and normal (HT 3). The silages were fed ad libitum to 18 goats of the Norwegian dairy goat breed in early lactation and supplemented with a low (LC; 0.6Â kg per goat daily) or normal (NC; 1.2Â kg per goat daily) level of concentrate. The experiment was conducted as a cyclic changeover design with four periods of 28 days using three blocks of goats according to their initial body condition (poor, medium or high body condition). Silages contained 771, 696 and 619Â g digestible organic matter per kg dry matter in silage (D-value) for HT 1, 2 and 3, respectively. Postponing the harvesting time decreased (P<0.001) silage dry matter intake (DMI) and silage DMI per kg body weight (BW). Increased concentrate allowance decreased silage DMI, with substitution rates (decrease in silage DMI when concentrate dry matter intake is increased, kg/kg) of 0.43, 0.21 and 0.27 at HT 1, HT 2 and HT 3, respectively. Milk yield and yields of milk constituents decreased (P<0.001) with delayed harvesting time and thus reflected the changes in silage D-value. Milk free fatty acids (FFA) concentration was not affected by dietary treatments. The efficiency of nutrient utilization was best when LC was fed and increased with postponed harvesting time. The higher energy efficiency of the HT 3 LC fed goats indicates that these goats canalized a higher proportion of energy intake to milk production, compared to goats fed NC and earlier harvested silage. Marginal ECM production response to increased net energy lactation (NEL) intake were higher when intake was increased due to higher silage digestibility (0.14Â kg ECM/MJ NEL) compared with increased NEL intake due to increased concentrate level (0.12Â kg ECM/MJ NEL). Improving silage quality by earlier harvesting time resulted in higher feed intake and milk yield than obtained by the same increase in NEL intake by concentrate supplementation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Animal Feed Science and Technology - Volume 163, Issues 2â4, 11 February 2011, Pages 150-160
Journal: Animal Feed Science and Technology - Volume 163, Issues 2â4, 11 February 2011, Pages 150-160
نویسندگان
I. Dønnem, Ã
.T. Randby, M. Eknæs,